Design and Implementation of High-Speed Carry Look-Ahead Decimal Adder (CLDA) Using CMOS Technology

Project Code :TVMABE318

Objective

The objective is to design and implement a high-speed Carry Look-Ahead Decimal Adder (CLDA) using CMOS technology for enhanced arithmetic performance in digital systems. The project aims to improve the speed of decimal addition by reducing carry propagation delay through parallel carry generation logic. Using CMOS-based circuit design, the focus is on optimizing parameters such as delay, power consumption, and area, making the adder suitable for high-performance arithmetic units in processors, digital signal processing (DSP), and real-time computing applications.

Abstract

Decimal arithmetic is gaining more attention by researchers due to their importance in many human-centric applications. Hardware implementations of decimal arithmetic are preferable over their software counterparts as the former leads in performance especially when it comes to real-time applications. Decimal addition is a main decimal operation as most of the other decimal operation can be implemented using decimal addition. Complementary Metal Oxide Semiconductor (CMOS) technology has the advantage of reducing the average power consumption and the propagation delay in digital systems. Decimal adders can be designed as a ripple carry addition (RCA) structure or as a carry look-ahead addition (CLA) structure with the latter being faster with extra hardware cost. This work proposes two CMOS-based carry look-ahead decimal adders (CLDAs) that can be used within any decimal arithmetic unit. Operands of 1-digit size, 2-digit size, 3-digit size, and 4-digit size are investigated. The Boolean logic for each of the proposed CLDAs is developed and the CMOS realization is provided. The circuit of each of the proposed CLDAs is simulated with 45 nm technology library using the LT-SPICE spice simulation tool. The simulation shows promising results in terms of speed, power, and power delay product (PDP).

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Block Diagram

Specifications

Software Requirements:

· Tool: Tanner

Hardware Requirements:

· Microsoft® Windows XP

· Intel® Pentium® 4 processor or Pentium 4 equivalent with SSE support

· 512 MB RAM

· 100 MB of available disk space

Learning Outcomes

Importance of Transistors

Types of adders
NMOS/PMOS/CMOS Technologies
How to design circuits using Transistor logic?
Adder with different logic
Applications in Real time.
Importance of logic gates in memory.

Demo Video

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Front End Domains

Cadence EDA
Finite State Machines
Arithmetic Core
DSP Core
Communications
Nano Technology
Testing

Back End Domains

Nano Technology
Cadence EDA
Low Power VLSI
Core Memories
Transistor Logic

Tools

FPGA
H-Spice
Cadence EDA
QCA
Xilinx Vivado
Xilinx ISE
Tanner EDA
LT-Spice

Others

Matlab Interfacing

H-Spice

LT-Spice